The reason is that we need references to both ProgressBars as arguments to the callback, and at the time the Scale constructor is invoked, they are not all defined yet.
原因在于，我们需要以对两个ProgressBar的引用作为回调的参数，而当Scale构造函数被调用时，它们还没有被定义。
The building's location within a conservation area prompted the architects to develop a proposal that is sympathetic to its context, and references the scale of the neighbouring buildings.
建筑的位置在交流区内，促使建筑师想出一个建议——支持其所处的环境，并参考邻近建筑物的规模。
Through introducing the successful example, the article could hopefully furnish valuable references for the design, operation and commissioning of future large-scale W flame boilers in China.
本文作为大容量W型火焰锅炉的成功范例，可为我国今后大容量W型火焰锅炉的设计、运行调整提供参考。
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